For sea creatures, the best type of camouflage depends greatly on the conditions and the depth. When it's comparatively light, transparency is the best defense, but in the deep ocean where predators provide their own light sources, being a less reflective, dark color protects better. The octopus Japetella heathi and the squid Onychoteuthis banksii both demonstrate the ability to do either switching according to changes in depth, visibility, light sources.